What does the 3 stand for in 7,414,311.8? 0.3 30 300 3

Monthly water bills for a city have a mean of $108.43 and a standard deviation of $32.09. find the probability that a randomly selected bill will have an amount greater than $155, which the city believes might indicate that someone is wasting water. would a bill that size be considered unusual?

Through non-collinear points there is exactly one plane.

How to simply and write the answer n a whole number